This image is a composite of separate exposures acquired by the WFC3/IR and ACS/WFC instruments. Several filters were used to sample various wavelengths. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:

Hubble observed galaxy cluster Abell S1063 with the Advanced Camera for Surveys (ACS) using visible-light filters. Simultaneously, Hubble was able to observe a field parallel to Abell S1063 with the Wide Field Camera 3 (WFC3) using infrared filters. Six months later, the observations were reversed such that WFC3 infrared observations were taken of Abell S1063, while ACS visible-light observations were made on the same parallel field. Together, the ACS and WFC3 filters combine to produce a deep image of both fields. Here, the parallel of Abell S1063 is strewn with galaxies of all shapes and sizes. The Hubble Frontier Field parallel images are a "two-for-the-price-of-one" efficient way to use the telescope to learn more about the early universe.